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Printer does not use black toner for black in color mode
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nagmat84
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PostPosted: Sat Aug 03, 2019 10:45 am    Post subject: Printer does not use black toner for black in color mode Reply with quote

I have a Kyocera C5150N color laser printer. If I print something and select "Color mode: Gray" in the printer dialog, then the black cartridge is used. However, if I select "Color mode: Color" the black catridge is not used at all even for black parts. The black parts rather become a very dark slightly greenish gray which obviously is mixed out of cyan, magenta and yellow. Is there any way to make the printer use real black for black even in color mode?

I often have text documents that consists of black text and some technical drawings. In this case the black letters of the text body and black lines of the drawings should be printed as real black. It does not seem to depend on the application. Hence, I guess that it is a CUPS/driver problem. The effect is always the same: directly printing from LibreOffice, exporting a PDF from LibreOffice and then printing the PDF with Okular, running the PDF through Ghostscript first and convert it to CMYK, creating a SVG graphics with Inkscape in CMYK, using pdfLaTex to produce a PDF or printing an image from Gimp. In all theses cases black is substituted by a mix of CMY, even if the original file uses the CMYK model.
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NeddySeagoon
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PostPosted: Sat Aug 03, 2019 11:01 am    Post subject: Reply with quote

nagmat84,

That's often a feature in the printer setup.

In Firefox|Print|Colour
I get Text Neutral Gray and Graphics Neutral Gray dropdowns.
I can choose 4-colur or black only.

I use black only. That appears to produce the right results. 4-colur gives a muddy black/gray.


I suspect its printer and application dependant too.
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papas
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PostPosted: Sat Aug 03, 2019 5:57 pm    Post subject: Reply with quote

Probably, the problem is the conversion from rgb to cmyk, not the driver or something else. Try to print a odt document or rgb text from inkscape, this way the driver will handle the colour conversion. Pdf has a very confused colour management.


:oops:
You have already try other documents I am sorry about my post...
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Blind_Sniper
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PostPosted: Sun Aug 04, 2019 7:52 am    Post subject: Reply with quote

it's a common behaviour of color printers.
Not sure about Kyocera, but Canon uses pigment ink (black) for text, and water based ink (CYM) for colour printing.
If you will try to print a text in a black mode (using pigment ink ) on a glossy paper there is a risk that the text will be smeared on paper when you touching it. Water based (CMY) ink is not subject to such a defect. May be it's a reason why printer uses only CMY when printing in colour mode (it is assumed that glossy photo paper can be used)?

I'd try to search web for how to adjust colour profile for your printer so it would mixed inks into correct black colour
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nagmat84
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PostPosted: Mon Mar 23, 2020 7:16 pm    Post subject: Reply with quote

NeddySeagoon wrote:
That's often a feature in the printer setup.

In Firefox|Print|Colour
I get Text Neutral Gray and Graphics Neutral Gray dropdowns.
I can choose 4-colur or black only.

I use black only. That appears to produce the right results. 4-colur gives a muddy black/gray.

But this way the whole output becomes gray scaled/black, also the images. If I select "Black Text" ord "Black Graphics" the printer switches to grayscaled mode. The difference between both option is only some optimization for readability of text vs. rasterazition of images.

That is not what I want. I want the printer to use black toner for black text, but still use color toner for colored images. Moreover, it does not solve the problem with LibreOffice.
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